What's New in Concrete and Concrete Floors—

Serial Information: Civil Engineering—ASCE, 1978, Vol. 48, Issue 3, Pg. 80-91


Document Type: Feature article

Abstract: What's new in concrete and concrete floors? Dig into that subject and you find that among the most interesting and important recent developments are (1)Post-tensioned flat slab floors; (2)flying and tunnel forms; (3)super plasticizers/super water reducers; and (4) vacuum dewatering. The first is a relatively new structural design that is growing in popularity in buildings of various types, especially hotels and apartments. Reason is lower cost. The second development is gaining favor because of lower costs, on certain jobs, thanks to labor savings due to reuse of forms. The third development is an additive to concrete mixes that changes their characteristics, sharply boosts slump, but only for the first 10 to 60 minutes. It has two uses: in precasting plants, it permits lower concrete water content, thus permitting stripping of forms earlier, and in field-cast concrete, it is used to radically boost slump, temporarily, to speed concrete placement. The fourth development involves sucking water out of newly placed concrete floor slabs, in order to speed finishing and curing, and to improve quality of the floor.

Subject Headings: Buildings | Concrete | Floors | Labor | Post tensioning | Precast concrete | Prestressed concrete | Productivity

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